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Entity Relationship Diagrams
Entity “An entity is a business object that represents a group, or category of data.”1 Do we know a similar concept? 1) Stephens, R.K. and Plew. R.R., Database Design. SAMS, Indianapolis , IN.
Attribute “An attribute is a sub-group of information within an entity.”1 Do we know a similar concept? 1) Stephens, R.K. and Plew. R.R., Database Design. SAMS, Indianapolis , IN.
Entity Relationship ModelsMandatory Relationships Optional Relationships Many-to-Many Relationships One-to-Many Relationships One-to-One Relationships Recursive Relationships
Mandatory, Many-to-ManyINSTRUCTOR STUDENT INSTRUCTOR STUDENT
Optional, Many-to-ManyDEPARTMENT STUDENT DEPARTMENT STUDENT
Optional/Mandatory, Many-to-ManyINSTRUCTOR SKILL INSTRUCTOR SKILL
Optional/Mandatory, One-to-ManyPRODUCT VENDOR PRODUCT VENDOR
Mandatory, One-to-One AUTOMOBILE ENGINE AUTOMOBILE ENGINE
Recursive EMPLOYEE supervises is supervised by
Resolving Many-to-Many RelationshipsMany-to-many relationships should be avoided. We can resolve a many-to-many relationship by dividing it into two one-to-many relationships.
Resolving Many-to-Many RelationshipsSALES ORDERS INV. ITEMS SALES ORDERS INV. ITEMS ORDER ITEMS
Example (ER Diagram) SALES ORDERS INV. ITEMS ORDER ITEMS CLERKSCUSTOMERS
Lecture 03 Entity-Relationship Diagram. Chapter Outline.
Chapter 12 Enhanced Entity-Relationship Modeling Transparencies © Pearson Education Limited 1995, 2005.
Logical Database Design Transparencies 1. ©Pearson Education 2009 Objectives How to create a set of tables from an ER model. How to check that the tables.
Database design concepts info1408 Lecture 8 Worked example of E:R Modelling.
Week 5 Relational Database Design by ER- -to-Relational Mapping.
CS 370 Database Systems Lecture 9 The Relational model.
the Entity-Relationship (ER) Model
0 - 0.
Chapter 9: Logical Database Design and the Relational Model (ERD Mapping)
Relational Database Design Via ER Modelling
Past Tense Probe. Past Tense Probe Past Tense Probe – Practice 1.
Enhanced ER modeling techniques Transparencies
Conceptual Design Lecture - 2 Database Development.
Problem # Problem #
Slide 1 Insert your own content. Slide 2 Insert your own content.
Lab 3 Alternative ER Modelling Pearson Education © 2009.
An entity-relationship diagram (ERD) is a specialized graphic that illustrates the interrelationships between entities in a database.
Database Design – Lecture 4 Conceptual Data Modeling.
Advantages and disadvantages, architectures and data models
Data Modeling and Relational Database Design. Analyze and model the relationships between entities Draw an initial entity relationship diagram Read the.
1 SA0951a Entity-Relationship Modelling. 2 What is it about? ER model is used to show the Conceptual schema of an organisation. Independent of specific.
Entity Relationship (E-R) Modeling
Slide 1 Chapter 05 – Part 2 Data Modeling with the Entity-Relationship Model.
Database Management System
Lecture 10 Conversion to tables Database Design Concepts INFO1408.
ER Modeling Case Studies
Concepts of Database Management Sixth Edition
Advanced Database and Client Server Applications Susan Curtis, Paul Crowther, Alan Houldcroft, Peter Lake, John Whitfield.
Copyright © 2004 Pearson Education, Inc.. Chapter 3 Data Modeling Using the Entity-Relationship Model.
Entity Relationship Modeling BUS112 Professor Kwan.
Conceptual Modelling The Entity-Relationship (ER) Model The ER diagram Data Modelling.
Transform an ER Model into a Relational Database Schema
Introduction to SQL 1 Lecture 5. Introduction to SQL 2 Note in different implementations the syntax might slightly differ different features might be.
Lecture 4 Conceptual Data Modeling. Objectives Define terms related to entity relationship modeling, including entity, entity instance, attribute, relationship,
1 Entity-Relationship Modeling. 2 ER Graphical modeling technique Informal, understandable for laymen Coarse technique to design tables Provides rules.
Author: Graeme C. Simsion and Graham C. Witt Chapter 8 Organizing the Data Modeling Task.
ER to Relational Translation COMSATS INSTITUTE OF INFORMATION TECHNOLOGY, VEHARI.
Addition 1’s to 20.
ENTITY RELATIONSHIP DIAGRAM. Objectives Define terms related to entity relationship modeling, including entity, entity instances, attribute, relationship.
Tutorial on E-R Diagrams 1.Learn basic terminology and symbols –See next four slides; refer to as needed in steps 2-4 below 2.Learn the basics of E-R diagramming.
Test B, 100 Subtraction Facts
Copyright © 2011 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Chapter 9 Relational Database Design by ER- and EER-to- Relational Mapping.
DIVIDING INTEGERS 1. IF THE SIGNS ARE THE SAME THE ANSWER IS POSITIVE 2. IF THE SIGNS ARE DIFFERENT THE ANSWER IS NEGATIVE.
Copyright © 2011 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Chapter 7 Lecture # 17 July 28,2012 Data Modeling using the Entity Relationship.
Jozef Kuper. Describe a Database Entities Atributes Relationships.
University of Toronto Department of Computer Science © Steve Easterbrook. This presentation is available free for non-commercial use with attribution.
Entity-Relationship Modeling I The cautious seldom err. Confucius.
Database Development Data Analysis: The Entity Relationship Powered by DeSiaMore1.
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